July 2012
Intermediate to advanced
712 pages
27h 27m
Polish
book
Wysoko wydajne MySQL. Optymalizacja, archiwizacja, replikacja. Wydanie II
by Baron Schwartz, Peter Zaitsev, Vadim Tkachenko, Jeremy D. Zawodny, Arjen Lentz, Derek J. Balling
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Rozdział 3. Optymalizacja schematu i indeksowanie
Optymalizacja kiepsko zaprojektowanego lub błędnie zindeksowanego schematu może poprawić wydajność bazy danych o rząd wielkości. Jeżeli wymagana jest wysoka wydajność działania, schemat i indeksy bazy danych trzeba zaprojektować pod kątem określonych zapytań, które będą wykonywane. Należy także oszacować wymagania związane z wydajnością dla różnego rodzaju zapytań, ponieważ zmiany wprowadzone w jednym zapytaniu lub schemacie mogą mieć wpływ na inne elementy bazy danych. Optymalizacja często wiąże się z kompromisami. Przykładowo dodanie indeksów przyśpieszających pobieranie danych jednocześnie spowoduje spowolnienie operacji uaktualniania danych. Podobnie zdenormalizowany schemat może przyśpieszyć ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.